Possible error with executables

[Enlil]

Hello,
I have recently tried making some executables, but they do not seem to run-I get the following console window:

******************************************************************************
** Loading SceneTransitionEngine.py
******************************************************************************
** ERROR: Failed to set pixel format (The handle is invalid.)
** ERROR: Release Device Context Failed. (Invalid device context (DC) handle.)
Traceback (most recent call last):
  File "<string>", line 11, in <module>
  File "C:\Users\CWANAM~1\AppData\Local\Temp\nszC8EC.tmp\Script\SceneTransitionE
ngine.py", line 214, in <module>
    viz.go()
  File "C:\Program Files (x86)\WorldViz\Vizard4\python\viz.py", line 2240, in go

    _ipcSend(_VIZ_GO,mode,window,'',0.0,0.0,0.0,0.0)
RuntimeError: Failed to initialize graphics window
** Load Time: 0.25 seconds
** WARNING: There were errors in your script, press any key to exit

Am I doing something wrong, or is there a problem with the executable. The OS is Windows 7 if that might make a difference.

Christian